hgeditor

revset-_descendant: rework the whole sorting and combining logic

We use the & operator to combine with subset (since this is more likely to be
optimised than filter) and we enforce the sorting of the result. Without this
enforced sorting, we may result in a different iteration order than the set
_descendent was computed from.

This reverts a bad `test-glog.t` change from 69402eb72115.

Another side effect is that `test-mq.t` shows `qparent::` including `-1` if
`qparent is -1`. This sound like a positive change.

This has good and bad impacts on the benchmarks, here is a good ones:

revset: 0::
before) wall 0.045489 comb 0.040000 user 0.040000 sys 0.000000 (best of 100)
after)  wall 0.034330 comb 0.030000 user 0.030000 sys 0.000000 (best of 100)

revset: roots((0::) - (0::tip))
before)  wall 0.134090 comb 0.140000 user 0.140000 sys 0.000000 (best of 63)
after) wall 0.128346 comb 0.130000 user 0.130000 sys 0.000000 (best of 69)

revset: ::p1(p1(tip))::
before) wall 0.143892 comb 0.140000 user 0.140000 sys 0.000000 (best of 55)
after)  wall 0.124502 comb 0.130000 user 0.130000 sys 0.000000 (best of 65)

revset: roots((0:tip)::)
before) wall 0.204966 comb 0.200000 user 0.200000 sys 0.000000 (best of 43)
after) wall 0.184455 comb 0.180000 user 0.180000 sys 0.000000 (best of 47)

Here is a bad one:

revset: (20000::) - (20000)
before) wall 0.009592 comb 0.010000 user 0.010000 sys 0.000000 (best of 222)
after)  wall 0.029837 comb 0.030000 user 0.030000 sys 0.000000 (best of 100)

#!/bin/sh
#
# This is an example of using HGEDITOR to create of diff to review the
# changes while commiting.

# If you want to pass your favourite editor some other parameters
# only for Mercurial, modify this:
case "${EDITOR}" in
    "")
        EDITOR="vi"
        ;;
    emacs)
        EDITOR="$EDITOR -nw"
        ;;
    gvim|vim)
        EDITOR="$EDITOR -f -o"
        ;;
esac


HGTMP=""
cleanup_exit() {
    rm -rf "$HGTMP"
}

# Remove temporary files even if we get interrupted
trap "cleanup_exit" 0 # normal exit
trap "exit 255" HUP INT QUIT ABRT TERM

HGTMP=$(mktemp -d ${TMPDIR-/tmp}/hgeditor.XXXXXX)
[ x$HGTMP != x -a -d $HGTMP ] || {
  echo "Could not create temporary directory! Exiting." 1>&2
  exit 1
}

(
    grep '^HG: changed' "$1" | cut -b 13- | while read changed; do
        "$HG" diff "$changed" >> "$HGTMP/diff"
    done
)

cat "$1" > "$HGTMP/msg"

MD5=$(which md5sum 2>/dev/null) || \
    MD5=$(which md5 2>/dev/null)
[ -x "${MD5}" ] && CHECKSUM=`${MD5} "$HGTMP/msg"`
if [ -s "$HGTMP/diff" ]; then
    $EDITOR "$HGTMP/msg" "$HGTMP/diff" || exit $?
else
    $EDITOR "$HGTMP/msg" || exit $?
fi
[ -x "${MD5}" ] && (echo "$CHECKSUM" | ${MD5} -c >/dev/null 2>&1 && exit 13)

mv "$HGTMP/msg" "$1"

exit $?